## Related questions with answers

Occasionally, when I fill my car with gas, I figure out how many miles per gallon my car got. I wrote down those results after six fill-ups in the past few months. Overall, it appears my car gets 28.8 miles per gallon. a) What statistic have I calculated? b) What is the parameter I'm trying to estimate? c) How might my results be biased? d) When the Environmental Protection Agency (EPA) checks a car like mine to predict its fuel economy, what parameter is it trying to estimate?

Solution

Verifieda) the average of the miles per gallon of the six fill-ups

b) The parameter is the topic that is investigated.

PARAMETER: Miles per gallon of the car

c) Selection bias will exclude part of the population, measurement or response bias will use a method that gives different values from the true value and nonresponse bias is the results of not having data for everybody in the sample.

BIAS: response bias (because you could make measurement errors)

d) The parameter is the topic that is investigated.

PARAMETER: Miles per gallon of a type of car

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